ProgressDialog

写一个handler

 myHandler = new Handler()
        {
        	@Override
        	public void handleMessage(Message msg) {
        		super.handleMessage(msg);
        		try
    			{
    				if(checkNetWork.isNetworkAvailable(MainActivity.this))
    				{
    					User user = HttpConn.getUser(Consistent.Login_username,
    							Consistent.Login_password);
    					if (null != user && !user.getName().equals("")) {
    						Intent intent = new Intent(MainActivity.this,
    								MainGridViewActivity.class);
    						intent.putExtra(Consistent.USERID, user.getId());
    						intent.putExtra(Consistent.USERNAME, user.getUserName());
    						intent.putExtra(Consistent.PASSWORD, user.getPassword());
    						intent.putExtra(Consistent.USER, user.getName());
    						startActivity(intent);
    						finish();
    					} else {
    						Toast.makeText(MainActivity.this, "用户名或密码错误！",
    								Toast.LENGTH_LONG).show();
    						pwd.setText("");
    					}
    				}
    				else
    				{
    					new ApprovalDialog(MainActivity.this,"系统提示","请检查您的网络连接是否正常!",ApprovalDialog.WARN).show();
    				}
    				
    			}catch(Exception e)
    			{
    				e.printStackTrace();
    				new ApprovalDialog(MainActivity.this,"系统提示","请检查您的服务器IP地址是否正确!",ApprovalDialog.WARN).show();
    			}
        	}
        };

	}

点击按钮

case R.id.BTNLogin:
			progressDialog = ProgressDialog.show(MainActivity.this, 
					 "数据验证中！", "请稍候...", true, false);
			timer.schedule(new TimerTask(){

				@Override
				public void run() {
					Message message = new Message();
					message.setTarget(myHandler);
					message.sendToTarget();
				}
				
			}, 100);
			
			break;